<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // string 转数值
      var a = '100abc'
      var b = parseInt(a)
      console.log(a, b) // 100 整数型

      // string 转数值
      var a = '100.23abc'
      var b = parseFloat(a)
      console.log(a, b) // 100.23 浮点数型
    </script>
  </body>
</html>
